Your wife still needs to sign I-864 Form, an affidavit of support for you to adjust your status in the U.S. She can refuse to sign the affidavit. She does not need any reason to cancel your case. I-130 is her petition. The best approach is work your relationship with your wife.
There are two options : Application for non relinquished domicile Form I 191 or his children can file on Form I 130 for Alien relatives. The second option is sleight or ward if one of his children is Us citizen.